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Shareholders' Equity and Long-Term Incentive Compensation - Income (Loss) Per Share (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 39.3 | $ 6.8 | $ 19.7 | $ 12.4 | $ 60.0 | $ 22.0 | $ (8.3) | $ 10.3 | $ 78.2 | $ 84.0 | $ 30.3
Less: Net loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.4)
Adjustment related to redeemable noncontrolling interest (Note 14) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (18.1)
Income from continuing operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share |  |  |  |  |  |  |  |  | 78.2 | 84.0 | 12.6
Income (loss) from discontinued operations, net of tax | $ (0.1) | $ (0.2) | $ 3.3 | $ 0.0 | $ (1.4) | $ 0.3 | $ (0.7) | $ 7.1 | 3.0 | 5.3 | (97.9)
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income (loss) from discontinued operations attributable to SPX Corporation common shareholders for calculating basic and diluted income per share |  |  |  |  |  |  |  |  | $ 3.0 | $ 5.3 | $ (97.9)
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted-average number of common shares used in basic income (loss) per share |  |  |  |  |  |  |  |  | 43,054 | 42,413 | 41,610
Dilutive securities — Employee stock options, restricted stock shares and restricted stock units (in shares) |  |  |  |  |  |  |  |  | 1,606 | 1,492 | 551
Weighted-average number of common shares and dilutive securities used in diluted income (loss) per share |  |  |  |  |  |  |  |  | 44,660 | 43,905 | 42,161
Unvested Restricted Stock And Restricted Stock Units that did not Meet Required Market Thresholds for Vesting |  |  |  |  |  |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Number of awards that were excluded from the computation of diluted income per share (in shares) |  |  |  |  |  |  |  |  | 234 | 563 | 1,045
Stock options |  |  |  |  |  |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |  |  |  |
Number of awards that were excluded from the computation of diluted income per share (in shares) |  |  |  |  |  |  |  |  | 875 | 997 | 1,343

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